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The University of California, Office of the President is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non-AIA members are available on request. This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
Learning Objectives 1. You will identify the criteria that exemplify new
construction best practices in HVAC design and retrofitting.
2. The learner will identify the technologies useful for HVAC efficiency including indirect/direct evaporative cooling, a heat pipe heat recovery loop to dehumidify air in high-density areas, solar thermal installations, and the modification of exhaust stack height and discharge velocity.
3. You will compare and contrast the range of strategies and technologies to energy savings.
Sustainability Best Practices for HVAC Design Student Rec Center Renovation
Cal Poly State University, San Luis Obispo
Presented to the California Higher Ed Sustainability Conference
June 22, 2010
Presented by
Dennis K. Elliot, PE, CEM Assistant Director, Energy, Utilities and Sustainability
Facility Services
Monica Amalfitano, PE, LEED AP Mechanical Engineer, P2S Engineering
Rec Center HVAC Design
Cal Poly at a glance:
Founded 1901 Over 300 Buildings 5.8M gsf 19,000 Students 6,200 Residents 2,200 Faculty & Staff 10,000 acres “Learn by doing”
Rec Center HVAC Design
Student Recreation Center
Student fee funded Completed 1993 90,300 gsf 5 court gym/event center Aerobics/dance room Weight training/cardio Wrestling/martial arts Lap pool Racquetball courts Sand volleyball courts
Rec Center HVAC Design
Rec Center Expansion Project Funded by student fee referendum New features and spaces:
Additional 2 court gymnasium and Multi Activity Center Separate leisure pool and Wellness Center Indoor running track and additional fitness space
Adding 85,000 gsf, $71M budget, completion Winter 2012 Architect: Cannon Design Engineer: P2S Contractor: Sundt Cx: Digital Energy
Rec Center HVAC Design
Project Goals:
Add air conditioning !?!# Students want “Green Design” Significantly exceed Title 24 Achieve LEED Certification Evaluate new technologies where appropriate Highly controllable and user friendly Interactive design process High level of student involvement Advance the “campus standard”
Rec Center HVAC Design
Facilities Input and Campus Standards:
Serve from campus central plant Push back against AC - try to minimize air conditioning demand Consider IDEC – Indirect/Direct Evaporative Cooling for gyms Cooling is needed for concerts and commencement ceremonies Field trip to CSU Sonoma to evaluate IDEC Use Siemens Apogee building automation for IDEC units Evaluate solar thermal for pool heating Make decisions based on life cycle cost Design for long life and maintainability
Rec Center HVAC Design
Student Input and Participation:
Student Fee referendum and LEED vote 75% voted to fund building expansion 87% voted to require LEED certification!! “LEED the Way” marketing campaign and YouTube video by Green Campus Program
Students from ASI involved in project programming and goal setting Green Campus Internships for academic credit:
Architecture students working on LEED docs ASHRAE club students assisting with Cx
Rec Center HVAC Design
Mechanical System Design
Design Challenges Increased air changes Increased Energy consumption LEED Silver
San Luis Obispo OSA BIN Data review 0.5% ASHRAE Design Day, 87F DB/64F WB 400 hours/year DB temperatures > 78F 100 hours/year DB temperatures > 85-90F 30 hours/year WB temperatures > 65 F
Rec Center HVAC Design
Rec Center HVAC Design
Payback Analysis
Conventional CHW v. IDEC/DEC BIN Data analysis First Costs (AHU and extended underground piping) Annual utility charges of CHW/HHW to ASI Annual additional maintenance costs of IDEC/DEC Dolphin System vs. chemical treatment IDEC DX vs. IDEC CHW final stage cooling Annual additional water and sewer charges Annual energy savings
Savings 160,000 kwH/year Less than 10 year payback
Rec Center HVAC Design
2 Stage Indirect/Direct Evaporative Cooling – 10 AHU 8 utilized IDEC/DEC 2 utilized IDEC with Heat Pipe technology
Design Benefits Maximizes moderate/drier OSA climate 100% OSA Cooling Media is water, consumes 25% less than cooling towers Peak tonnage is 380 tons. Only 50 tons of supplemental cooling required from campus central plant when OSA conditions are higher than ideal (will occur only 20% out of the year). VAV application
Reduction of fan energy Turn down increases indirect evaporative cooling effectiveness (IEE) of heat pipe and direct evaporative cooling.
160,000 kwH/year savings (HVAC only) Payback is less than 10 years PG&E Incentives
Rec Center HVAC Design
AHU-10 Schematic
Rec Center HVAC Design
AHU – 10 ASHRAE Design Day
Rec Center HVAC Design
AHU – 10 Higher WB Lower DB
Rec Center HVAC Design
Building Energy Performance
Building exceeds T24 by 24.7% Overall building considerations
HVAC design High efficiency lighting and daylighting/dimming control Envelope design
R-35 Roof Low E glass
Over $200,000 in incentives 220 Peak KW savings 452,000 kWh savings 27,000 therm savings
Meets requirements of Cal Poly “Green Design” and LEED Silver
Expected Performance:
Title 24 calculations
Annual TDV energy use (Performance Method) Baseline: 61.07 kBtu/ft2 - yr Design: 41.59 kBtu/ft2 - yr Compliance margin: 19.5%
Rec Center Lighting Design
Contact info and references: Dennis Elliot, PE, CEM Assistant Director of Energy, Utilities, and Sustainability Cal Poly Facility Services [email protected] Monica Amalfitano, PE, LEED AP Mechanical Engineer P2S Engineering [email protected] www.sustainability.calpoly.edu www.greencampus.calpoly.edu www.asi.calpoly.edu/rec_center_project www.p2seng.com www.munters.us/en/us/Division-start-pages/Munters-DH-Division/Indirect-Heating--Cooling2/
Rec Center HVAC Design
This concludes The American Institute of Architects Continuing Education Systems Program